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JD 4450 PS tranny issues
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bgunzy
Posted 6/19/2012 21:27 (#2438672)
Subject: JD 4450 PS tranny issues



Humeston, IA

Was pulling a nearly empty 28% sidedress rig back to the coop tonight (15th speed, road gear) when all of a sudden the "Trans Pres" light came on and the tractor started to coast.  I clutched, came to a stop, put it in park, then tried to put it in gear again.  Nothing.  Turned off the tractor engine, started up again, and was able to put it in gear and drive off.  Hmm. 

On the return trip (not pulling anything) it did this to me twice again.  Loose forward motion, Trans Pres light comes on, STOP light comes on with warning.  I can turn the engine off, back on again, and can drive (but for how long?).

Any ideas on what may be going on?  1986 JD 4450 with 15 spd powershift.  Thanks!

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fairviewfarmer
Posted 6/19/2012 21:34 (#2438689 - in reply to #2438672)
Subject: RE: JD 4450 PS tranny issues


my 4630 PS acted that way when the tranny pump went out.
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Tim in WI
Posted 6/19/2012 21:36 (#2438695 - in reply to #2438672)
Subject: RE: JD 4450 PS tranny issues



Embarrass WI

My 4450 just needed a trans pressure sender. Service mgr at the dealer talked me through it, said they have a high failure rate. It's behind a shield on the side of the trans under the cab door, about the size of a 7/8 deep well socket.

My tractor never stopped moving, though. Just light and beeper. 

Edit---#6 in the picture 

 RXP7/RXP7666________UN01JAN94.gif



Edited by Tim in WI 6/19/2012 21:41
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TD15
Posted 6/19/2012 22:01 (#2438765 - in reply to #2438672)
Subject: RE: JD 4450 PS tranny issues


The coasting part would have me worried. If it was mine I would hook up some test gauges and check transmission pressures.
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pirlbeck
Posted 6/19/2012 22:35 (#2438873 - in reply to #2438672)
Subject: RE: JD 4450 PS tranny issues


I would be dropping the hyd oil and pulling the sump screen.....it may be plugged with brake lining material.
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SDFarmboy
Posted 6/19/2012 22:38 (#2438879 - in reply to #2438695)
Subject: RE: JD 4450 PS tranny issues


Tim:

Lots of difference between just a sender problem, and having the tractor lose any transmission function. 

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JDTECH
Posted 6/19/2012 22:44 (#2438903 - in reply to #2438873)
Subject: X2...........................nt


NEMO

.

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Tim in WI
Posted 6/19/2012 22:46 (#2438916 - in reply to #2438879)
Subject: RE: JD 4450 PS tranny issues



Embarrass WI

Agreed.

I had a minor brainfart and for a fleeting moment thought the trans problem could be electronically related. I know better, the 15 speed doesn't need any electricity to work.

In my defense, I did say that my tractor never stopped moving. I didn't intend for my opinion to be an absolute diagnosis, mostly tossing out a possible thing to check.

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KelB
Posted 6/20/2012 02:43 (#2439208 - in reply to #2438672)
Subject: Re: JD 4450 PS tranny issues


Ayr Queensland Australia 4807
Transmission pump woodruff key is a possible cause sounds like a tricky one let us know what you find. I wonder if the tow disconnect is working its way out and goes back in when it starts
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big ed
Posted 6/20/2012 05:45 (#2439240 - in reply to #2439208)
Subject: Re: JD 4450 PS tranny issues


southeast, pa.
my 4450 just went to shop same thing. found c1&c2 pac bad
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ahay68979
Posted 6/20/2012 08:13 (#2439341 - in reply to #2439240)
Subject: Re: JD 4450 PS tranny issues


Saronville NE
Sounds like new tranny to me, exactly why I will never own another 15spd PS been into 1 and had another go bad, nothing $15k-20k wont fix, good luck. Ill take a good ol quadrange anyday, they are bullet proof compared to a 15sp PS. Been into them too but cheap to fix vs the PS.
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bgunzy
Posted 6/20/2012 13:01 (#2439732 - in reply to #2438765)
Subject: Re: JD 4450 PS tranny issues



Humeston, IA
Perhaps it wasn't exactly coasting...more like it came to a stop after a few jerks. Definitely not a free wheel, but not an abrupt stop, either.

What I thought was odd that it started shifting/moving properly again after shutting off the tractor.
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dfm100
Posted 6/20/2012 18:39 (#2440246 - in reply to #2438672)
Subject: RE: JD 4450 PS tranny issues


When you lose enough transmission pressure, the shift valves move the transmission into neutral. Also, the engagement over-ride valve moves to the shutoff position and keeps the transmission from going into gear, until you reset it by moving the shift lever to park or "neutral-neutal".
Could your problem be as simple as being low on oil and your pump started sucking air when you were in 15th gear?
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